Hey everyone, please help. I am about to rip my hair out. I have a 3GS with the old bootrom that was upgraded to iOS4. I have my SHSHs stored on Cydia going back to 3.1. I downgraded to 3.1.2 fine, and then used redsn0w to JB to custom 3.1.2. I then used pwnagetool to create a custom 4.0 FW and upgraded. I have done this 3 times now, and no matter what I do my iphone has no carrier logo and no service. When I go into the general settings of my phone, it doesnt even list my phone number. It was synced and backed up with iTunes just fine. What do I need to do? Do I need to install Ultrasn0w even tho Im on AT&T???